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Why doesn't Java need to import classes like Integer, String, etc. while it needs to import other classes?
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Java has an import statement that allows you to import an entire package (as in earlier examples), or use only certain classes and interfaces defined in the package. The import statement is optional in Java.
Java automatic importsJava compiler automatically imports two packages: java. lang and the current package. The Constants class is located in the same package as the AutomaticImports which is referring to its version member. In this example, we refer to some classes that are automatically imported by Java compiler.
No, java. lang package is a default package in Java therefore, there is no need to import it explicitly. i.e. without importing you can access the classes of this package.
The import statement can be used to import an entire package or sometimes import certain classes and interfaces inside the package. The import statement is written before the class definition and after the package statement(if there is any). Also, the import statement is optional.
There is an implicit import of java.lang.*.
From the Java specification:
A compilation unit automatically has access to all types declared in its package and also automatically imports all of the public types declared in the predefined package
java.lang.
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